Water leaking from your furnace's exhaust pipe is a sign of a problem. Discover the common causes of condensation leaks.
High-Efficiency Quirks
If you have a high-efficiency furnace (identifiable by white PVC exhaust pipes), condensation is a normal byproduct of the heating process. However, that water should drain away properly, not leak from the pipes.
Common Causes of Leaks
- Blocked Drain Line or Trap: The most common cause. If the internal drain trap or tubing is clogged with dirt or mold, water backs up and leaks out.
- Improper Pipe Slope: The PVC exhaust pipe must be sloped slightly back toward the furnace so condensation can drain. If it sags, water pools and leaks.
- Cracked Heat Exchanger: A more serious issue where the secondary heat exchanger is damaged.
Take Action
Water leaks can damage your furnace's internal components and your home. If you notice water pooling around your furnace, call a professional to clear the drains and inspect the venting.
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